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Calculate delt g for
Pbl2(s) + Pb2+(aq) +2I-(aq)
T= 25C
Kp= 8.7x10-9
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- The chromium in an aqueous sample was determined by pipetting 10.0 ml. of the unknown into each of five 50.0-mL volumetric flasks. Various volumes of a standard containing 12.2 ppm Cr were added to the flasks, following which the solutions were diluted to volume. Unknown,mLStandard, mLAbsorbancc 10.00.00.201 10.010.0 0.292 10.020.0 0.378 10.030.0 0.467 10.040.0 0.554 (a) Plot the data using a spreadsheet. (b) Determine an equation for the relationship between absorbance and volume of standard. (c) Calculate the statistics for the least-squares relationship in (b). (d) I)ctcrmine the conccnt ration oÍCr in ppm in the sample. (e) Find the standard deviation of the result in (d).From the ff reactions thermal data 2 Fe (5) 2 Fe 0 (n 가을 02 (9) = re203 (1) +// 02 197 = Tez 03 (1) Fe 21 Fe (s) + 2H+ (a=17 = H* (a=1) Ξ 02 (9) H₂ H₂197 + calculate the Fe 0 (s) + : = H₂0 (1) Ho of 2H¹ ca=1) Z (a=1) the reaction at 25 ue. + H₂(a) H₂D + Fe 2+ AH (cal) - 196, 500 cal - - 47, 900 21, 000 (9=1) 0 GS, 320 cal CGI (alpart A:> to Calculate Concentzahion, use M,V, = M2V2 AB1 - 0.025 M X 2.5 ml = ax 5 ml %3D 0.0125 M 0.01 M x 2. S ml= 5°-]x Ŝ ml [s2] = 0.008 M 0. 002 M 11 2 a - X = 0. 01 M Sohtion a 9- X timels) 9-X ABI 0-0125 0-0025 0.01 0. 223 84.8 0.016구 0.0016구 0.015 0.10 구 니1.2 AB 2 0.0 S16 19.5 O.02 0. 00 1 0. 이19 AB 3 0. 0164 0.0816 28.5 0.이구8 0. 0014 AB 니 0. 0022 0.011 구 0.172 60 AB § 0.이139 0.270 95.2 O. ol14 0.0027 0.008구 A8 6 0. 389 14 5.5 0.0096 0.0031 0.0065 AB구
- 2Cr(s) + 3Cu2+(aq) ⟶ 2Cr3+(aq) + 3Cu(s) Calculate the EcellCalculate e° values for the galvanic cells based on the following overall reactions. Assume that all concentrations are 1.0 M and that all partial pressures are 1.0 atm.(d) 3-13. Distis me Jum 4 A method of analysis yields weights for gold that are low by 0.4 mg. Calculate the caused by this uncertainty if the weight of gold in the sample is (a) 900 mg. (c) 150 mg. 1-7. The method described in Problem 3-6 is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample weight should be taken if the relative error resulting from a 0.4-mg loss is not to exceed -0.2%? percent relative error (a) (b) (b) 600 mg. (d) 30 mg. 3-14. Wha stan stam 3-15. Сог mea (b) -0.5%? (a) -0.8%? (c) (d) 1.2%? 3.5 3-8. The color change of a chemical indicator requires an overtitration of 0.04 mL. Calculate the percent relative error if the total volume of titrant is (a) 50.00 mL. (c) 25.0 mL. 3-9. A loss of 0.4 mg of Zn occurs in the course of an analysis to determine that element. Calculate the per- cent relative error due to this loss if the weight of Zn in the sample is (a) 40 mg. (c) 400 mg. 3.1 3.1 (b) 10.0 mL. 3.3 2.5 (d) 40.0 mL. Fo (a (E (b) 175…
- M (2022-23) Unit 1: Mole Concept, Unit 4 (FR) (Version 2) Assessment: Chemical Reactions 0.90 0.80- 0.70- 3 0.60 0.50- 0.40- 0.30- Absorbance 2. To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and some inert materials, solutions with known [Co²+] are prepared and the absorbance of each of the solutions is measured at the wavelength of optimum absorbance. The data are used to create a calibration plot, shown below. 0.20 0.10- 0.00+ ㅏ 0.005 0.010 34 0.015 Concentration (M) .04 co₂ 100- pertoc A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted with water to a final volume of 50.00 mL. Assume that all the cobalt in the ore sample is converted to Co²+ (aq). (a) What is the [Co²+] in the solution if the absorbance of a sample of the solution is 0.74 ? (b) Calculate the number of moles of Co²+ (aq) in the 50.00 mL solution. (c) Calculate the mass percent of Co in the 0.630 g sample of the ore. Answer…O TPSS Bookmarks CHEMISTRY EOY BELL QUESTIONS - TUE - FRI - 3/23 - 3/26 CHEMISTRY I 12-7 (AARON JAMES, ID: 12390724) >Baso, (s)+ 2NaCI(aq) BaCl, (aq) + Na,S0, (aq)- 1.78 g 2.00 g 1.00 g A student mixes a barium chloride (BaCh) solution with a sodium sulfate (Na, SO) solution to make barium sulfate (BaSO4) precipitate. Some of the masses are shown below the equation. How many grams of Naz SO, are required to produce 2.00 grams of BaSO ? A 1.22 grams 4.78 grams C 0.22 grams 3.00 gramsI had used the E= Ecell - (RT/ nF ) InQ and got that n=2 I'm not sure what I'm doing wrong. Thanks!
- Aime Dater Page No. - lag (2x1)+log141 2X10 me [4]What is the key equation for spectrometry experiments? O q rxn = -q_cal %3D O d=m/V O A= ebC O at endpoint, mol acid = mol baseGiven the Ksp for Ag2CrO4 is equal to 1.20 x 10-12, calculate the percent error in your experimentally determined value for average Ksp (this will be an extremely large percentage – think about why).